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Harley was peacefully chilling out on the couch, reading a book, when suddenly Tony jumped at him from behind the couch
He yelled "Surprise!", before immediately starting to tickle his belly.
Harley shrieked and started laughing instantly, completely bewildered by the sudden tickle attack.
"Tohohny whahahat thehe heheehll"
"It's tickle time~"
With that he spiderd his fingers under Harley's shirt and all over his bare belly, squeezing his sides and clawing at the sensitive flesh, driving Harley absolutely insane.
His laughter was squeaky and frantic, his head thrown back with a wide smile, while he uselessly tried to bat at Tony's evil fingers.
And to his dismay one of those fingers made it into his bellybutton, making him squeal and snort in-between his laughter.
At that point Harley was feeling absolutely mortified, his face cheery red, struggling madly but not being able to remove Tony's finger from his bellybutton.
Fortunately Tony seemed to notice that he had enough of that spot and moved his fingers into his armpits, which were still incredibly ticklish, but at least he stopped snorting.
Unfortunately he didn't count with Tony simultaneously blowing a huge raspberry on his belly. He bucked his hips screaming bloody murder, which resolved into hiccupy laughter.
"Ooh, that was adorable do that again" Tony teased
"Nohoho" Harley cried, but it was no use.
Tony blew another raspberry, getting the same reaction.
But as Harley's laughter began to go silent he let up, not wanting to murder the boy.
Harley curled up instantly, taking deep breaths, trying to get himself together.
When he had caught his breath he asked "What on earth was that for?"
"Just for fun" Tony said ruffling his already messed up hair, Harley being to tired to stop him.
"Besides your cute when your laughing" he commented, making him blush even more.
"Your insufferable"
"Love you to Harls" he said cheerily, making his way put of the room, most likely to get Peter as his next victim.
Things you put up with for your family, at least there was always bright laughter brightening the house.